16818223 has 4 divisors (see below), whose sum is σ = 16852968. Its totient is φ = 16783480.

The previous prime is 16818209. The next prime is 16818227. The reversal of 16818223 is 32281861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16818223 - 2⁹ = 16817711 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16818227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16636 + ... + 17617.

It is an arithmetic number, because the mean of its divisors is an integer number (4213242).

Almost surely, 2^16818223 is an apocalyptic number.

16818223 is a deficient number, since it is larger than the sum of its proper divisors (34745).

16818223 is an equidigital number, since it uses as much as digits as its factorization.

16818223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34744.

The product of its digits is 4608, while the sum is 31.

The square root of 16818223 is about 4101.0026822717. The cubic root of 16818223 is about 256.2084026867.

The spelling of 16818223 in words is "sixteen million, eight hundred eighteen thousand, two hundred twenty-three".